JPS6382257A - Discriminator for paper sheet - Google Patents

Abstract

PURPOSE:To accurately discriminate between a corner fold and a corner breakdown as well as to aim at improvement in piecewise accuracy, by checking up on the corner lacking quantity of a square and each thickness of paper sheets and detecting the thick range, in case of a discriminator for the corner fold and the corner breakdown of a bill or the like in a consumer transaction facility. CONSTITUTION:A bank bill (paper sheet) P to be conveyed on a conveying passage 11 is detected of its thickness by a thickness detector 12. The detected value made by this detector 12 is fed to a range calculation circuit 13 which compares the thickness detected value with the thickness reference value out of a thickness reference setting circuit 14, and thereby calculates a thickness abnormal range in a square (four corners) of the bank bill P. The calculated result out of this circuit 13 is fed to an angular state discriminator circuit 15. And, in the conveying passage 11, there is provided with a form detector 16, while a detecting element 16 consists of a light source 17 and a bill shade detector 18. Positional information out of this detector 18 is fed to a corner lacking quantity calculation circuit 19. This circuit 19 calculates the corner lacking quantity on the basis of the positional information out of the detector 18 and feeds it to a circuit 15 which discriminates an angular state by a discriminating table 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a paper sheet discriminating device for detecting and discriminating folded corners, torn corners, etc., in, for example, automatic transaction machines.

(Prior Art) In recent years, automated teller machines installed in financial institutions such as banks temporarily store banknotes (banknotes) inserted by a customer, and then dispense banknotes when another customer withdraws banknotes. It is a circulation type. This type of automated teller machine detects and determines whether the banknotes inserted by the customer have bent corners or torn corners (cut corners), and determines whether the banknotes are in a state beyond the permissible range, that is, those with severely torn corners or Items that have been repaired, such as cracks that have been repaired with tape, etc., will be excluded as exclusion tickets.
Excluded tickets (unfit tickets) determined to exceed the allowable range are prevented from being paid out to customers. Additionally, items with severely bent corners will be returned to the customer without being accepted.

By the way, in the above-mentioned automated teller machine, detection and determination of folded corners, torn corners, etc. of banknotes is performed only based on the shapes of the four corners. That is, the determination is made based on whether or not the corners of the squares of the banknotes are missing (corners are missing). For this reason, it is not possible to distinguish between a folded corner and a torn corner, and a bank note with a folded corner is erroneously determined to be a torn corner and is rejected.

Therefore, the thickness of the square of the banknote is detected, and depending on whether the thickness of the corner part is thicker than the standard thickness (thickness abnormality) or not, the banknote with a folded corner can be detected. A banknote with a torn corner can be distinguished from a banknote with a torn corner.

However, in the device that detects the thickness described above,
The determination is made based on the comparison result between the thickness of the corner portion and a reference value. For this reason, even if the corner fold is within the allowable range (the amount of corner breakage is small), the thickness may be abnormal due to the corner fold or because tape etc. have been pasted. There was a drawback that the accuracy of classification by discrimination was low, as there were cases where banknotes with folded corners (genuine banknotes) could be mistakenly identified as repaired banknotes and rejected. .

(Problems to be Solved by the Invention) This invention eliminates the drawback of low classification accuracy by discrimination, and can accurately discriminate corner bends and corner tears.
It is an object of the present invention to provide a paper sheet discrimination device that can improve classification accuracy through discrimination.

[Structure of the Invention] (Means for Solving the Problems) The paper sheet discriminating device of the present invention includes a corner missing amount detection means for detecting the amount of corner missing within a specific range of squares of paper sheets being conveyed. and a thickness detection means for detecting the thickness within the specified rectangular range of the paper sheet, and by comparing the thickness detected by this thickness detection means with a reference value, the range of this thickness abnormality is determined. and a calculation means for calculating the above-mentioned square notch Q t? <It is composed of a determining means for determining whether a corner is bent or a corner is torn based on the detection result by the mountain means and the calculation result by the calculation means.

(Function) This invention examines the amount of missing corners and thickness in the squares of paper sheets, and detects the thickened area to determine whether the corners are folded or torn, and the banknotes with folded corners can be detected. This makes it possible to accurately distinguish between banknotes and repaired banknotes.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a banknote (paper sheet) P that is conveyed longitudinally in the direction of the arrow shown on the conveyance path 11 is
The thickness is detected by a thickness detector 12 placed in the middle.

This thickness detector 12 consists of a plurality of detector rollers and sensors arranged in a row on a roller, and each detector roller moves up and down depending on the thickness of the bank note P being conveyed. As a result, a voltage value corresponding to the amount of fluctuation of the detector roller is generated from the corresponding sensor.

That is, the thickness of each square of the bank note P is detected by signals from the thickness detectors 12 located at positions corresponding to both ends of the reference width of the bank note P.

Regarding this thickness detection, Japanese Patent Application No. 59-8392
Since it is explained in detail in the specification of No. 8, detailed explanation thereof will be omitted here. The thickness detection value by the thickness detector 12 is supplied to a range calculation circuit 13.

The range calculation circuit 13 compares the thickness detection value from the thickness detector 12 with the thickness reference value from the thickness reference value setting circuit 14, thereby calculating the square (four corners) of the banknote P, that is, each This is to calculate the range of thickness abnormality (length of thickness abnormality) at the corner portion.

The thickness reference value setting circuit 14 has a banknote P in advance.
The thickness of the dummies (bank notes) is set as the thickness reference value, or the average value when a plurality of dummies (bank notes) are flown is set as the thickness reference value.

That is, the range calculation circuit 13 inputs the detected thickness value from the thickness detector 12 to the thickness reference value setting circuit 14 in advance.
The thickness of the banknote P is compared with the thickness standard value of the banknote P set to The thickness in the square is detected, and the range in which the detected thickness exceeds the standard thickness value is calculated as the range of thickness abnormality. The calculation result from the range calculation circuit 13 is supplied to the corner state determination circuit 15.

Further, a shape detection section 16 is provided in front of the thickness detector 12 on the conveyance path 11 through which the bank note P is conveyed.
The shape detection section 16 detects the shape of the bank note P.

This shape detecting unit 16 uses a light source 17 that irradiates light onto the bank note P to be conveyed, and the position information of both ends of the bank note P every 1 mm obtained by the irradiation of light from this light [17]. It is composed of a winding shape detector 18 that detects the shape. The position information from the winding shape detector 18 is supplied to a corner missing amount calculation circuit 19.

This corner cutout total calculation circuit 19 calculates the corner cutout amount (corner fold amount or corner tear amount) in the square of the bank note P, that is, in each corner portion of the banknote P, based on the position information from the winding shape detector 18. It is. That is, the total corner cutout calculation circuit 19 calculates the area within a predetermined range based on the position information from the winding shape detector 18, and calculates the corner cutout amount by comparing this area with the reference area of the bank note within the predetermined range. is calculated. Furthermore, regarding the detection of this amount of corner defects, Japanese Patent Application No. 1983-
Since it is explained in detail in the specification of No. 83928, detailed explanation thereof will be omitted here. The calculation result by the corner cutout total calculation circuit 19 is supplied to the corner state determination circuit 15.

The corner condition determination circuit 15 calculates the thickness abnormality range for each corner portion from the range calculation circuit 13 and the amount of corner breakage for each corner portion from the corner cutout total calculation circuit 19, depending on the respective size. At the same time, by referring to the preset discrimination table 20, the angle for each corner is divided into levels according to the range of thickness abnormality and the level according to the amount of corner chipping for the same corner. This is to determine whether the corner is bent, torn, or has been repaired.

As shown in FIG. 2, the above-mentioned discrimination table 20 shows that the condition of the corresponding corner portion of the bank note P is determined according to each level corresponding to the range of thickness abnormality and each level corresponding to the amount of corner missing. "0"
, data indicating whether it is broken "1" or repaired "2" is arranged with a certain tolerance. As a result, by referring to the data at the positions corresponding to each level corresponding to the range of thickness abnormality and each level corresponding to the amount of corner missing, the state of the corresponding corner portion of banknote P can be determined by It is now possible to determine whether the item is torn or has been repaired.

That is, the angular condition discriminating circuit 15 classifies the range of thickness abnormalities from the range calculating circuit 13 based on Table 1 shown below.

Table 1 Next, the amount of corner cuts from the total corner cut calculation circuit 19 is classified into levels based on Table 2 shown below.

Then, by searching the discrimination table 20 using the level corresponding to the range of thickness abnormality and the level corresponding to the amount of corner chipping as pointers, the condition of the corner part is determined, The signal is supplied to the control circuit 21 which is currently operating.

The gate control circuit 21 switches and controls the gate 22 based on the determination result from the angular state determination circuit 15. That is, when the corner condition determination circuit 15 determines that the bank note P has a torn corner or has been repaired, the gate control circuit 21 switches the gate 22 to the position shown by the broken line in the figure, and rejects the bank note P as a rejected note. Collection section 2
It is designed to be collected in 3 days.

Next, the operation of the angular state discriminating circuit 15 having the above configuration will be explained.

For example, the range calculation circuit 13 detects the range of thickness abnormality according to the thickness of the bank note P detected by the thickness detector 12. Further, the amount of corner notches is detected by the total corner notch calculation circuit 19 according to the shape of the bank note P detected by the shape detection section 16. Then, the range calculation circuit 1
It is assumed that the thickness abnormality range and the amount of corner defects are respectively supplied from the corner defect total calculation circuit 19 to the corner state determination circuit 15 from 3 to 3.

Then, the corner state discriminating circuit 15 uses the above-mentioned Tables 1 and 2.
The range of thickness abnormality and the amount of corner breakage are each leveled according to the size shown in . Then, the determination table 20 is referred to using these levels, that is, the level corresponding to the range of thickness abnormality and the level corresponding to the amount of corner breakage, as pointers.

For example, the range calculation circuit 13 supplies r13mzJ as the range of thickness abnormality, and the total corner cutout calculation circuit 19 supplies r (13X 13) / 2 m! as the corner cutout amount. Assume that I2J is supplied. Then, the corner state determination circuit 15 determines from Table 1 that the range equal to or greater than the thickness is level "2". Further, from Table 2, the amount of corner defects is determined to be level "2". and,
The determination table 20 is referred to using these levels, that is, level "2" corresponding to the thickness abnormality range and level "2" corresponding to the corner notch, as pointers. As a result, as shown in Table 3 below, it is determined from the corresponding data "0" in the determination table 20 that the banknote P is in a folded corner state (FIG. 3),
A signal indicating this is output to the gate control circuit 21.

Further, for example, suppose that the range calculation circuit 13 supplies "0" as the range of thickness abnormality, and the total corner cutout calculation circuit 19 supplies r (18X 18) / 2vm2J as the corner cutout amount. Then, the corner state determination circuit 15 determines from Table 1 that the range equal to or greater than the thickness is level "1". Also, Table 2
From this, the amount of missing corners is determined to be level "3". Then, the determination table 20 is referred to using the level "1" corresponding to the range of the thickness abnormality and the level "3" corresponding to the amount of corner cutout as pointers. As a result, as shown in Table 3, it is determined from the corresponding data "1" in the determination table 20 that the bank note P is in a torn corner state (FIG. 4), and a signal indicating this is sent to the gate control circuit. Output to 21.

Further, for example, assume that the range calculation circuit 13 supplies r28ml as the range of thickness abnormality, and the corner cutout amount calculation circuit 19 supplies "0" as the corner cutout amount. Then, the corner condition discrimination circuit 15 classifies the range of thickness or more from Table 1 as level "5".
”. Further, from Table 2, the amount of corner defects is determined to be level "1". Then, the determination table 20 is referred to using the level "5" corresponding to the range of the thickness abnormality and the level "1" corresponding to the amount of corner breakage as pointers. As a result, as shown in Table 3, it is determined from the corresponding data "2" in the determination table 20 that the banknote P has been repaired by the tape T (FIG. 5), and a signal indicating this is transmitted. Gate control circuit 21
Output to.

Table 3 As a result, banknotes P determined to have folded corners
The banknotes P are conveyed to a later stage (not shown) through the gate 22, and the banknotes P determined to have a torn corner or have been repaired are collected via the gate 22 into the rejected note collection section 23.

As described above, the amount of missing corners and the thickness of the squares of the banknote are checked, and the thickened range is detected. This allows it to be determined whether the corner is folded or torn, and it is also possible to accurately distinguish between banknotes with folded corners and repaired banknotes to which tape or the like has been applied. Therefore, it is possible to prevent banknotes with folded corners from being mistakenly rejected as repaired banknotes, and to improve the classification accuracy.

In other words, the condition of the corners of banknotes, etc., is determined separately for folded corners, torn corners, and repaired notes, so it is possible to distinguish between good notes, damaged notes,
This improves the performance of sorting rejected tickets. Therefore, it is particularly useful when inspecting banknotes, for example.

In the above embodiments, a mechanical thickness detector is used, but the thickness detector is not limited to this. For example, an optical device that detects the thickness by irradiating light onto a banknote and detecting the amount of transmitted light can be used. It may be something similar.

In addition, although a case has been described in which the case of detecting and determining whether a banknote has a folded corner, a torn corner, or has been repaired has been described, the present invention is not limited to this. It can also be applied to detect and determine if corners are bent, torn, or repaired.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a paper sheet discriminating device that can accurately discriminate folded corners and torn corners, and can improve the classification accuracy through discrimination.

[Brief explanation of the drawing]

FIG. 1 is a block diagram schematically showing a paper sheet discrimination device according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of a discrimination table,
FIG. 3 is a diagram showing an example of a corner-folded state of a banknote, FIG. 4 is a diagram similarly showing an example of a corner-broken state, and FIG. 5 is a diagram similarly showing an example of a repaired state. 12... Thickness detector, 13... Range calculation circuit, 14
. . . Thickness reference value setting circuit, 15 .
... Square missing complete calculation circuit, 20... Discrimination table, P... Bank note. Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (6)

[Claims] (1) A corner missing amount detection means for detecting the amount of missing corners within a specific range of squares of the paper sheets to be conveyed; and a thickness detecting means for detecting the thickness of the paper sheets within a specific range of the squares. , a calculation means for calculating the range of the thickness abnormality by comparing the thickness detected by the thickness detection means with a reference value; A paper sheet discriminating device comprising: a discriminating means for discriminating whether a paper sheet has a bent corner or a torn corner. (2) The paper sheet discriminating device according to claim 1, wherein the corner missing amount detecting means detects the corner missing amount based on the shape of a ticket shadow of the paper sheet. (3) The paper sheet according to claim 1, wherein the thickness detection means detects the thickness based on the amount of movement of a detector that moves according to the thickness of the paper sheet. type of discrimination device. (4) The paper sheet discriminating device according to claim 1, wherein the thickness detection means detects the thickness based on the amount of light transmitted from the paper sheet. (5) The discriminating means divides the detection results from the corner missing amount detection means and the calculation results from the calculation means into levels, and by referring to a discriminant table set in advance for each level, detects bent corners, 2. The paper sheet discriminating device according to claim 1, wherein the device determines whether the paper sheet is torn or has been repaired. (6) The paper sheet discriminating device according to claim 1, wherein the paper sheet is a bank note.